Genesis 48:18

18 And Joseph said to his father, Not so, father; for this is the first-born; lay thy right-hand upon his head.

Genesis 48:18 Meaning and Commentary

Genesis 48:18

And Joseph said unto his father, not so, my father
It is not right, it should not so be, that the right hand should be put on the youngest, and the left hand on the eldest; for this [is] the firstborn;
directing him to Manasseh, and seeking to guide his hand towards him: put thy right hand upon his head;
Joseph was for proceeding according to the order of birthright, but Jacob was directed by a spirit of prophecy, as follows.

Genesis 48:18 In-Context

16 the angel who delivers me from all evils, bless these boys, and my name shall be called upon them, and the name of my fathers, Abraam and Isaac; and let them be increased to a great multitude on the earth.

17 And Joseph having seen that his father put his right hand on the head of Ephraim—it seemed grievous to him; and Joseph took hold of the hand of his father, to remove it from the head of Ephraim to the head of Manasse.

18 And Joseph said to his father, Not so, father; for this is the first-born; lay thy right-hand upon his head.

19 And he would not, but said, I know it, son, I know it; he also shall be a people, and he shall be exalted, but his younger brother shall be greater than he, and his seed shall become a multitude of nations.

20 And he blessed them in that day, saying, In you shall Israel be blessed, saying, God make thee as Ephraim and Manasse; and he set Ephraim before Manasse.